I think it is prudent for you to have an understanding of the "process" vs. an actual script for dealing with gate-keepers. The easiest way for me to get through the gatekeeper is to use the pitch on her and then ask. Do you think your boss would be interested in hearing more about X??? Works well to get appts. with the gatekeeper and/or her boss.
If the individual you are dealing with is giving you a hard time find another mentor who values your time......
If the individual you are dealing with is giving you a hard time find another mentor who values your time......